M3 M4 M5 Black Hex Allen Socket Machine Screws Button Head Bolt A2 Stainless Ste
● Thread Specification: M3, M4, M5. M3 M 4 M5 Hex Socket Allen Socket Button Head Machine Screws Bolts, Electrophoresis Black. - M4 series is suitable for 2.5mm wrenches. ● Head Style: Hex Socket Allen Socket Button Head.